William p



To all whom it may'concem:

WILLIAM F. LADD, OF NEW YORK, N. Y.

|MPRovEMENT"|NBo|LRs ou mG'EsTE-Rs FORMAKING PAPER-PULP.

Specification formingpart of Letters Patent N o. 115,357, dated May 30,1871.

Be it known thatI, WILLIAM F. LADD, of

i the city and State of N ewiYork, haveinvented anew and usefulImprovement in Boilers or Di gestersfor Makin g Paper-P ulp from Wood orStraw; and I do hereby declare that the followingis a full, clear, andexact description thereof, reference being had to the accompany! ingdrawing making a part hereof.

Figure l represents the boiler; Fig. 2, a view ofthe end of the same;and Fig. 3`is a perspcctive view of the boiler mounted on its trunnions.i

The same letters refer to the same parts in all the igures.`

. A, B, C, and. D represent a long cylindrical v boiler, hanging on apair of trunnions, T T

and T T, on both axis, with corresponding elevated bearings on` boxesfor each set of trunnions, so that the boiler may be made to turn oneither axis and revolve continuouslyr upon its longitudinal axis. Thereis an opening at Ifor the insertion of the stock used, closedby aman-hole, cover, or head, and a ,discharge-pipe at L, closed by asliding valve, v M, and `there is insidea sliding perforated diaphragmop erated by a stem extending through the boiler to the point N. O and Pare two i boxes,mounted on permanent uprights, which boxes may be madeto slide backward and forward. There are also boxes It and S', one orboth of which maybemadeto move or slide.

The operation is as follows: The digesteris supported upon thetrunnionsT T and the boxes `R and S,Wi,th the extremity having theman-holeopening M uppermost. It is chargedor filled with straw or Wood, Sac.,while in thisposition. Y After being lled with the` material theman-hole is closed, and the boiler is turned so asto bring its longestaxis horizontal, and the boxes O and P being moved into such position asto receive the trunnions T Tf. There is a cog-wheel at W, which meshesinto a cog-wheel, S, -in the boiler, and which continually revolves theboiler on its longest axis in a horizontalposition. This boiler may berevolved on its shortest axis so as to discharge at the same point atwhich it is charged, or so that it may be revolved conti'nuouslyonv thataxis. In that case the discharge-pipe may be dispensed with.

My boiler may be used in one of these ways:

It may be permanently revolved on its shortest axis, in which case it isfilled and discharged at the same man-hole, M; or, secondly, it may befilled by turning it on its shorti est axis into such a position as tobring the manhole M uppermost, and then afterward turning it so as tocontinuously revolve on its longest axis by means of the trunnions T Tand the boxes O and P, and when it is to be discharged it may bedischarged by the discharge-pipe L, that is at the lowest extremity, orthe man-hole, and may be turned down and discharged at M. A man-hole maybe'put in the side, if desired. Steam may be applied at either trunnionby union joints. There4 is a band, Z Y, surrounding the digester aboutthe middle of its length, to which the transverse trunnion T T may beattached, in which case the boiler will turn in the band Z Y. This planmay be resorted to instead of making the boxes movable and attaching thetrunnions directly to the boiler, as stated` above.

What I claim -as my invention, and desire to secure by Letters Patent ofthe United States, is-

1. A long cylindrical boiler or digester having two sets of trunnions,one set on its longest and one on its shortest axis, and havingcorresponding boxes, as described.

2. A cylindrical boiler or digester having two sets vof trunnions, thetrunnions on the short axis being attached to a band in which the boilercan turn when supported on the trunnions of 'the longitudinal axis.-

3. Placing trunnions on the short axis of a cylindrical boiler so thatthe boiler may be charged and discharged through the same man-hole.

4. A cylindrical boiler having trunnions o n its shortest axis and adischarge-valve at one extremity of its longest axis.

WM. F. LADD.

Witnesses WM. F. LADD, Jr., GEO. W. LADD.

